High quality steel wire ropes for fishing applications - Bridon

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Technical InformationTroubleshooting GuideTypical examples of Wire Rope deterioration1 Mechanical damage9 Typical wire fracturesdue to rope movementas a result of bendover sharp edgefatigue.projection whilst underload.2 Localised wear due to10 Wire fractures at theabrasion on supportingstrand, or corestructure.interface, as distinctfrom ‘crown’ fractures.3 Narrow path of wear11 Break up of IWRCresulting in fatigueresulting from highfractures, caused bystress application.working in a grosslyoversize groove, orover small supportrollers.4 Two parallel paths of12 Looped wires as abroken wires indicativeresult of torsionalof bending through animbalance and/or shockundersize groove in theloading.sheave.5 Severe wear,13 Typical example ofassociated with highlocalised wear andtread pressure.deformation.6 Severe wear in Lang’s14 Multi strand rope ‘birdLay, caused bycaged’ due to torsionalabrasion.imbalance.7 Severe corrosion.15 Protrusion of ropecentre resulting frombuild up of turn.8 Internal corrosion16 Substantial wear andwhilst external surfacesevere internalshows little evidence ofcorrosion.deterioration.08BRIDON Fishing
Technical InformationTroubleshooting GuideThe following is a simplified guide to common wire rope problems. More detailed advice can be obtained from any Bridondistributor. In the event of no other standard being applicable, Bridon recommends that ropes are inspected/examined inaccordance with ISO 4309.ProblemMechanical damage caused by the rope contacting thestructure of the installation on which it is operating or anexternal structure - usually of a localised nature.Cause/Action•Generally results from operational conditions.•Check sheave guards and support/guide sheaves toensure that the rope has not “jumped out” of theintended reeving system.•Review operating conditions.Opening of strands in rotation resistant, low rotation andparallel closed ropes - in extreme circumstances the ropemay develop a “birdcage distortion” or protrusion of innerstrands.Note - rotation resistant and low rotation ropes are designedwith a specific strand gap which may be apparent ondelivery in an off tension condition. These gaps will closeunder load and will have no effect on the operationalperformance of the rope.•Check sheave and drum groove radii using sheavegauge to ensure that they are no smaller than nominalrope radius +5% - Bridon recommends that the sheaveand drum groove radii are checked prior to any ropeinstallation.•Repair or replace drum/sheaves if necessary.•Check fleet angles in the reeving system - a fleet anglein excess of 1.5 degrees may cause distortion.•Check installation method - turn induced duringinstallation can cause excessive rope rotation resultingin distortion.•Check if the rope has been cut “on site “ prior toinstallation or cut to remove a damaged portion fromthe end of the rope. If so, was the correct cuttingprocedure used? Incorrect cutting of rotation resistant,low rotation and parallel closed ropes can causedistortion in operation.•Rope may have experienced a shock load.Broken wires or crushed or flattened rope on lower layersat crossover points in multi - layer coiling situations.Wire breaks usually resulting from crushing or abrasion.•Check tension on underlying layers. Bridonrecommends an installation tension of between 2% and10% of the minimum breaking force of the wire rope.Care should be taken to ensure that tension is retainedin service. Insufficient tension will result in these lowerlayers being more prone to crushing damage.•Review wire rope construction. Dyform wire ropes aremore resistant to crushing on underlying layers thanconventional rope constructions.•Do not use more rope than necessary.•Check drum diameter. Insufficient bending ratioincreases tread pressure.Wires looping from strands.•Insufficient service dressing.•Consider alternative rope construction.•If wires are looping out of the rope underneath acrossover point, there may be insufficient tension on thelower wraps on the drum.•Check for areas of rope crushing or distortion.BRIDON Fishing09
Page 1 and 2: High quality steel wire ropes for f
Page 3 and 4: ContentsIntroduction ..............
Page 5 and 6: Trawl Warps and Purse WiresDYFORM
Page 7: Technical InformationThe reel stand
Page 11 and 12: Technical InformationTroubleshootin

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